The invention discloses a high-temperature propylene chlorination process
epichlorohydrin production waste water integrated treatment process, which belongs to the technical field of
environmental protection. Each high-temperature propylene chlorination process production enterprise is equipped with an electrolytic edible
saline solution section, a majority of enterprises adopt the edible
saline solution by exploiting underground brine, the brine contains a certain amount of Na2SO4 which influences the
electrolysis of the edible
saline solution, so that the Na2SO4 needs to be separated beforeelectrolysis of the edible saline solution. A great amount of CaCl2 is generated in a cyclization phase of the high-temperature propylene chlorination process for producing the
epichlorohydrin and enters waste water, and the treated CaCl2-containing waste water cannot be directly discharged. According to the above situation, Na2SO4 is adopted to react with CaCl2 to generate CaSO4, i.e.,
gypsum, and after the separation, the
gypsum can be used as an auxiliary material of a
cement factory; and after the reaction, the waste water containing a great amount of NaCl and COD enters an MCOP (modifiedcontact
oxidation process)
system to perform the biochemical reaction, the water produced in the reaction is oxidized at a high level to further remove COD, so that the COD of the discharged water isless than or equal to 60 mg / L, the waste water containing a great amount of NaCl can be used as a dilute saline solution for exploiting saline brine. By adopting the process, not only is the problem that the
utilization rate of the Na2SO4 is low solved, but also the
pollution emission problem of the CaCl2 can be solved, a purpose of treating the waste by using waste can be achieved, and the industrial policy of the national resource comprehensive utilization can be satisfied.